共查询到19条相似文献,搜索用时 93 毫秒
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非对称型超级电容器结合了双电层电容器和法拉第准电容器的优点,具备高能量密度和功率密度、循环寿命长等特性,成为近年来超级电容器领域的研究热点。非对称型超级电容器电极材料包括碳材料/过渡金属氧化物体系、碳材料/导电聚合物体系和金属氧化物/导电聚合物体系,综述了非对称型超级电容器电极材料的类型及研究进展。 相似文献
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碳纳米管在超级电容器中的应用研究进展 总被引:6,自引:4,他引:6
超级电容器是近年来发展起来的一种新型储能装置。碳纳米管由于具有独特的中空结构,良好的导电性和高的比表面积,被认为是超级电容器理想的电极材料之一,引起了广泛的关注。通过介绍碳纳米管在超级电容器中的应用研究进展,评述了碳纳米管、活化碳纳米管、碳纳米管/金属氧化物复合物以及碳纳米管/导电聚合物复合物用做超级电容器电极材料的特点和性能。认为单纯的碳纳米管由于比表面积小,比容量偏低。化学活化可以显著提高碳纳米管的比表面积,增大其比电容。将碳纳米管与准电容材料金属氧化物或导电聚合物复合。可以发挥各自的优势,从而得到低成本、高性能的复合电极材料,将是今后发展的一个方向。 相似文献
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Biomass-based porous carbon (BPC) with renewability and flexible nano/microstructure tunability has attracted increasing attention as efficient and cheap electrode materials for supercapacitors. To meet commercial needs, high mass-loading electrodes with high areal capacitance are preferred when designing supercapacitors. The increased mass percentage of active materials can effectively improve the energy density of supercapacitors. However, as the thickness of the electrode increases, it will face the following challenges including severely blocked ion transport channels, poor charging dynamics, poor electrode structural stability, and complex preparation processes. A bridge between theoretical research and practical applications of BPC electrodes for supercapacitors needs to be established. In this review, the advances of high mass-loading BPC electrodes for supercapacitors are summarized based on different biomass precursors. The key performance evaluation parameters of the high mass-loading electrodes are analyzed, and the performance influencing factors are systematically discussed, including specific surface area, pore structure, electrical conductivity, and surface functional groups. Subsequently, the promising optimization strategies for high mass-loading electrodes are summarized, including the structure regulation of electrode materials and the optimization of other supercapacitor components. Finally, the major challenges and opportunities of high mass-loading BPC electrodes in the future are discussed and outlined. 相似文献
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电化学超级电容器电极材料的研究进展 总被引:11,自引:0,他引:11
电化学超级电容器以其独特的大容量、大电流快速充放电和高的循环使用寿命等特点,受到世人的青睐,致使许多新型的电化学超级电容器电极材料相继被发现和应用.为进一步促进电化学超级电容器的发展,在综述了近年来出现的各种电化学超级电容器电极材料的基础上,提出按材料种类将其分为四大系列:碳材料系列、过渡金属氧化物系列、有机导电聚合物系列和其他系列.并就其各自的特点和性能进行了分析比较,得出了碳材料系列主要向高比表面积和可控微孔孔径方向发展和过渡金属氧化物系列主要向提高材料本身的利用率方向发展以及导电聚合物系列主要向无机、有机杂化方向发展的结论. 相似文献
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Kai Wang Haiping Wu Yuena Meng Zhixiang Wei 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(1):14-31
This Review provides a brief summary of the most recent research developments in the fabrication and application of one‐dimensional ordered conducting polymers nanostructure (especially nanowire arrays) and their composites as electrodes for supercapacitors. By controlling the nucleation and growth process of polymerization, aligned conducting polymer nanowire arrays and their composites with nano‐carbon materials can be prepared by employing in situ chemical polymerization or electrochemical polymerization without a template. This kind of nanostructure (such as polypyrrole and polyaniline nanowire arrays) possesses high capacitance, superior rate capability ascribed to large electrochemical surface, and an optimal ion diffusion path in the ordered nanowire structure, which is proved to be an ideal electrode material for high performance supercapacitors. Furthermore, flexible, micro‐scale, threadlike, and multifunctional supercapacitors are introduced based on conducting polyaniline nanowire arrays and their composites. These prototypes of supercapacitors utilize the high flexibility, good processability, and large capacitance of conducting polymers, which efficiently extend the usage of supercapacitors in various situations, and even for a complicated integration system of different electronic devices. 相似文献
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Nitrogen Codoped Unique Carbon with 0.4 nm Ultra‐Micropores for Ultrahigh Areal Capacitance Supercapacitors
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Junshuang Zhou Li Hou Sunrui Luan Jinlong Zhu Huiyang Gou Dong Wang Faming Gao 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(36)
A full understanding of ion transport in porous carbon electrodes is essential for achieving effective energy storage in their applications as electrochemical supercapacitors. It is generally accepted that pores in the size range below 0.5 nm are inaccessible to electrolyte ions and lower the capacitance of carbon materials. Here, nitrogen‐doped carbon with ultra‐micropores smaller than 0.4 nm with a narrow size distribution, which represents the first example of electrode materials made entirely from ultra‐microporous carbon, is prepared. An in situ electrochemical quartz crystal microbalance technique to study the effects of the ultra‐micropores on charge storage in supercapacitors is used. It is found that ultra‐micropores smaller than 0.4 nm are accessible to small electrolyte ions, and the area capacitance of obtained sample reaches the ultrahigh value of 330 µF cm?2, significantly higher than that of previously reported carbon‐based materials. The findings provide a better understanding of the correlation between ultra‐micropore structure and capacitance and open new avenues for design and development of carbon materials for the next generation of high energy density supercapacitors. 相似文献
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高体积比电容是柔性超级电容器的关键.在本文中,我们设计并制备了一种具有超高体积比电容和良好倍率性能的柔性复合电极.该膜电极以无孔且致密的聚苯胺作为基质,少量的还原氧化石墨烯片作为填料,通过一种新开发的溶液浇铸法制备而成.用于浇铸的溶液是由聚苯胺和氧化石墨烯的混合溶液自组装制备得到.关于还原氧化石墨烯作用的系统研究结果表... 相似文献
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超级电容器以其高功率、长周期使用寿命、环保等独特性能受到人们的广泛关注。决定超级电容器电荷存储的最关键因素是电极材料的特性。首先简要介绍了电容器的电荷储存机理。其次详细介绍了金属有机骨架材料(MOFs)、共价有机骨架材料(COFs)、二维过渡金属碳(氮)化物(MXenes)、金属氮化物(MN)、黑磷(BP)和有机分子电极材料等有望获得高能量密度和功率密度的新兴电极材料,以及最新制作的对称/非对称超级电容器的能量、电容、功率、循环性能和倍率性等参数。研究表明,COFs有望成为新一代廉价、绿色、可持续、多功能的储能装置的有机电极候选材料,其电化学性能仍有很大的提高空间。重点介绍了MOFs、COFs、MN、BP及近年来新型有机电极材料在超级电容器中的应用。最后,对超级电容器未来的发展和关键技术的挑战进行了展望。 相似文献
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多孔碳材料作为双电层电容器的主要电极材料,已成功应用于商业化超级电容器。但作为电极材料,纯碳材料表面疏水、内阻较大、电容较低等缺点使其进一步发展受到制约。近年来,随着超级电容器的迅速发展,氮掺杂多孔碳材料作为其电极材料引起研究人员的广泛关注,并采用不同的制备方法成功合成了一系列结构不同、性能优异的氮掺杂碳材料。基于超级电容器氮掺杂多孔碳电极材料的最新研究进展,首先介绍了氮在碳材料中的基本存在形式及对碳电极材料性能的影响,然后重点评述了氮掺杂碳电极材料的制备,最后总结了超级电容器氮掺杂碳材料的发展趋势。 相似文献
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近年来人们对储能设备的需求加大,超级电容器因其优异的性能而受到研究者青睐。二维过渡MXenes材料是一种类似于石墨烯的二维片层材料,具有独特的结构和丰富的官能团,其中Ti3C2TX MXenes材料因其具有优异的导电性、高比面积和高比电容等优点而被广泛用作超级电容器电极材料。然而,Ti3C2TX材料存在易氧化和自堆叠等问题,作为电极材料需要对其性能进行改性和优化。本文主要介绍了Ti3C2TX材料常用的制备方法(如HF刻蚀、氟化盐刻蚀、碱刻蚀、电化学刻蚀等)及Ti3C2TX在超级电容器应用过程的性能改性研究现状,包括构建Ti3C2TX多孔结构、进行表面修饰及制备Ti3C2TX复合电极,并展望了Ti3C2 相似文献